The Fungus Pyrenophora Tritici-Repentis Causes Disease in Wheat

question 32

Multiple Choice

The fungus Pyrenophora tritici-repentis causes disease in wheat.Only strains of P.tritici-repentis that contain the ToxA gene are able to cause disease;other strains are avirulent.The appearance of the toxin gene is recent;how does research indicate this gene was acquired?

• A)It is the result of mutation in a pigment gene in the fungus.
• B)It is the result of a mutation that up-regulated the expression of the previously non-expressed gene.
• C)It was transferred from a pathogenic bacterium to P.tritici-repentis.
• D)It was transferred from another pathogenic fungus to P.tritici-repentis.
• E)It was acquired through the rearrangement of two other genes in P.tritici-repentis.

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